Man, you never fail to educate me :) It is embarrassing for someone who consider himself a nature lover like me but I didnt even know we have the pearl mussel in my country! I just checked some Czech articles on this topic and you are 100% correct. It only lives in two little rivers in the south-western part of the country. Thank you for broadening my horizons again :)
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Hehe, don't worry about it. It's impossible to know every single species you have in your own county! It's just too many of them :P